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1 #ifndef CYGONCE_KERNEL_MFIXIMPL_HXX |
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2 #define CYGONCE_KERNEL_MFIXIMPL_HXX |
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3 |
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4 //========================================================================== |
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5 // |
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6 // mfiximpl.hxx |
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7 // |
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8 // Memory pool with fixed block class declarations |
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9 // |
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10 //========================================================================== |
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11 //####COPYRIGHTBEGIN#### |
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12 // |
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13 // ------------------------------------------- |
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14 // The contents of this file are subject to the Cygnus eCos Public License |
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15 // Version 1.0 (the "License"); you may not use this file except in |
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16 // compliance with the License. You may obtain a copy of the License at |
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17 // http://sourceware.cygnus.com/ecos |
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18 // |
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19 // Software distributed under the License is distributed on an "AS IS" |
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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21 // License for the specific language governing rights and limitations under |
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22 // the License. |
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23 // |
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24 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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25 // September 30, 1998. |
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26 // |
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27 // The Initial Developer of the Original Code is Cygnus. Portions created |
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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29 // ------------------------------------------- |
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30 // |
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31 //####COPYRIGHTEND#### |
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32 //========================================================================== |
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33 //#####DESCRIPTIONBEGIN#### |
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34 // |
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35 // Author(s): hmt |
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36 // Contributors: hmt |
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37 // Date: 1998-03-23 |
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38 // Purpose: Define Mfiximpl class interface |
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39 // Description: Inline class for constructing a fixed block allocator |
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40 // Usage: #include <cyg/kernel/mfiximpl.hxx> |
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41 // |
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42 // |
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43 //####DESCRIPTIONEND#### |
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44 // |
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45 //========================================================================== |
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46 |
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47 #include <cyg/kernel/ktypes.h> |
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48 #include <cyg/infra/cyg_ass.h> // assertion macros |
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49 #include <cyg/kernel/thread.hxx> |
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50 |
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51 class Cyg_Mempool_Fixed_Implementation { |
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52 private: |
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53 // these constructors are explicitly disallowed |
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54 Cyg_Mempool_Fixed_Implementation() {}; |
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55 // Cyg_Mempool_Fixed_Implementation( Cyg_Mempool_Fixed_Implementation &ref ) |
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56 // {}; |
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57 Cyg_Mempool_Fixed_Implementation & |
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58 operator=( Cyg_Mempool_Fixed_Implementation &ref ) |
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59 { return ref; }; |
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60 |
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61 private: |
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62 cyg_uint32 *bitmap; |
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63 cyg_int32 maptop; |
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64 cyg_uint8 *mempool; |
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65 cyg_int32 numblocks; |
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66 cyg_int32 freeblocks; |
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67 cyg_int32 blocksize; |
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68 cyg_int32 firstfree; |
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69 cyg_uint8 *top; |
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70 |
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71 public: |
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72 // THIS is the public API of memory pools generally that can have the |
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73 // kernel oriented thread-safe package layer atop. |
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74 // |
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75 // The kernel package is a template whose type parameter is one of |
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76 // these. That is the reason there are superfluous parameters here and |
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77 // more genereralization than might be expected in a fixed block |
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78 // allocator. |
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79 |
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80 // Constructor: gives the base and size of the arena in which memory is |
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81 // to be carved out, note that management structures are taken from the |
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82 // same arena. The alloc_unit may be any other param in general; it |
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83 // comes through from the outer constructor unchanged. |
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84 Cyg_Mempool_Fixed_Implementation( |
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85 cyg_uint8 *base, |
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86 cyg_int32 size, |
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87 CYG_ADDRWORD alloc_unit ); |
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88 |
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89 // Destructor |
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90 ~Cyg_Mempool_Fixed_Implementation(); |
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91 |
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92 // get some memory; size is ignored in a fixed block allocator |
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93 inline cyg_uint8 *alloc( cyg_int32 size ); |
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94 |
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95 // free the memory back to the pool; size ignored here |
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96 inline cyg_bool free( cyg_uint8 *p, cyg_int32 size ); |
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97 |
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98 // if applicable: return -1 if not fixed size |
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99 inline cyg_int32 get_blocksize() { return blocksize; } |
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100 |
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101 // these two are obvious and generic |
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102 inline cyg_int32 get_totalmem() { return blocksize * numblocks; } |
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103 inline cyg_int32 get_freemem() { return blocksize * freeblocks; } |
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104 |
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105 // get information about the construction parameters for external |
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106 // freeing after the destruction of the holding object |
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107 inline void get_arena( cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &alloc ) |
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108 { |
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109 base = (cyg_uint8 *)bitmap; |
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110 size = top - base; |
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111 alloc = blocksize; |
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112 } |
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113 |
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114 }; |
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115 |
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116 // ------------------------------------------------------------------------- |
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117 #endif // ifndef CYGONCE_KERNEL_MFIXIMPL_HXX |
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118 // EOF mfiximpl.hxx |
